Starting January 1st, 2013 the French thermal regulation will impose a minimum requirement for residential buildings air-tightness. However, nothing is planed for non-residential building, for two reasons:
- There is no clear view on the level to be imposed on non-residential building air-tightness
- Air-tightness impact on energetic consumption is different in non -residential and in residential buildings.
Through the measurer’s authorization process, it is possible to collect any measure done in France by certified measurer . This paper first presents the analyse of those data and the non-residential buildings air tightness level according to their volume, kind of construction and use. It also compares these results with the level of residential buildings Then the paper presents an estimation of the impact of air-tightness on energy consumption, according to various parameters (climatic zone, kind of ventilation, kind of building...). Calculations were realized with thermodynamic calculation tool included in the French national thermal regulation.